:root {
  color-scheme: light;
  --bg: #f4f7f2;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #667085;
  --line: #d8e0d5;
  --accent: #2f7d5c;
  --accent-dark: #236044;
  --warm: #f5b748;
  --soft: #e9f5ee;
  --wrong: #fff4e2;
  --wrong-ink: #7a4b00;
  --control: #eef2f6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f9fbf7 0%, var(--bg) 100%);
}

button {
  font: inherit;
}

.app-shell {
  width: min(1120px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 32px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 20px;
  align-items: stretch;
}

.listen-panel,
.status-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 18px 45px rgba(37, 54, 42, 0.1);
}

.listen-panel {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.status-panel {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.title-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
}

.eyebrow,
.label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 3rem);
  line-height: 1.15;
  letter-spacing: 0;
}

.question-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: #fbfdf9;
}

.settings-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #ffffff;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.setting-group {
  min-width: 0;
}

.segmented-control {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.setting-button {
  min-height: 46px;
  border: 1px solid #d7dee8;
  border-radius: 8px;
  background: var(--control);
  color: var(--ink);
  cursor: pointer;
  font-weight: 800;
}

.setting-button.selected {
  color: #ffffff;
  background: var(--accent);
  border-color: var(--accent);
}

.sentence-text,
.question-text {
  min-height: 3.6em;
  margin: 0 0 18px;
  font-size: clamp(1.55rem, 2.4vw, 2.35rem);
  line-height: 1.45;
  font-weight: 800;
}

.question-text {
  color: var(--accent-dark);
}

.primary-button,
.sub-button,
.choice-button {
  min-height: 54px;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 800;
}

.primary-button {
  width: 100%;
  color: #ffffff;
  background: var(--accent);
  font-size: 1.35rem;
}

.primary-button:hover {
  background: var(--accent-dark);
}

.choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.choice-button {
  background: var(--soft);
  color: var(--accent-dark);
  border: 2px solid #c7decd;
  font-size: 1.25rem;
}

.choice-button.selected {
  outline: 4px solid var(--warm);
  outline-offset: 2px;
}

.choice-button.correct {
  background: var(--soft);
  color: var(--accent-dark);
  border-color: var(--accent);
}

.choice-button.wrong {
  background: var(--wrong);
  color: var(--wrong-ink);
  border-color: #f1cf91;
}

.choice-button.manual {
  background: #ffffff;
  color: var(--ink);
}

.choice-button.manual[data-result="needs-help"] {
  background: var(--wrong);
  color: var(--wrong-ink);
  border-color: #f1cf91;
}

.voice-control {
  display: grid;
  gap: 8px;
}

.voice-control select {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
}

.control-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.sub-button {
  background: #eef2f6;
  color: var(--ink);
  border: 1px solid #d7dee8;
}

.score-text {
  margin: 0;
  font-size: 2.4rem;
  font-weight: 900;
}

.feedback {
  min-height: 84px;
  border-radius: 8px;
  padding: 16px;
  background: var(--soft);
  font-size: 1.15rem;
  line-height: 1.55;
  font-weight: 700;
}

.history {
  display: grid;
  gap: 10px;
}

.history-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fbfdf9;
}

.history-item p {
  margin: 0;
  line-height: 1.45;
}

.history-item .history-result {
  margin-top: 6px;
  font-weight: 800;
  color: var(--accent-dark);
}

@media (max-width: 860px) {
  .app-shell {
    width: min(100% - 20px, 680px);
    grid-template-columns: 1fr;
    padding: 18px 0;
  }

  .listen-panel,
  .status-panel {
    padding: 18px;
  }

  .title-row {
    align-items: flex-start;
  }

  .settings-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .choices,
  .control-row {
    grid-template-columns: 1fr;
  }

  .sentence-text,
  .question-text {
    font-size: 1.45rem;
  }
}

/* LiNest v3: 聴覚課題の正誤色を保ち、読みやすい静かな外枠に整える。 */
@media screen {
  body.linest-themed .app-shell {
    min-width: 0;
    padding-block: 28px 36px;
  }

  body.linest-themed :where(.listen-panel, .status-panel) {
    min-width: 0;
    border-color: var(--linest-border);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--linest-shadow);
  }

  body.linest-themed :where(.settings-panel, .question-card, .history-item) {
    border-color: var(--linest-border);
    background: #fdfbf7;
  }

  body.linest-themed .settings-panel {
    box-shadow: none;
  }

  body.linest-themed .setting-button {
    min-width: 0;
    border-color: var(--linest-border);
    background: #f7f3ec;
    color: var(--linest-heading);
  }

  body.linest-themed .setting-button.selected {
    border-color: var(--linest-green);
    background: var(--linest-green);
    color: #ffffff;
  }

  body.linest-themed .voice-control select {
    border-color: var(--linest-border);
  }

  body.linest-themed .feedback:not(.is-correct):not(.is-wrong) {
    background: var(--linest-green-soft);
    color: var(--linest-heading);
  }

  body.linest-themed :where(.title-row, .settings-panel, .choices, .control-row) > * {
    min-width: 0;
  }
}

@media screen and (max-width: 520px) {
  body.linest-themed .app-shell {
    width: min(100% - 20px, 680px);
  }

  body.linest-themed :where(.listen-panel, .status-panel) {
    padding: 16px;
  }

  body.linest-themed :where(button, select) {
    min-width: 0;
    white-space: normal;
  }
}